6.5" CDT Audio HD-6MDVC Dual 4 Ohm Audiophile Subwoofers can be wired for 2 Ohms HD-6MDVC Cast 6.5 Dual Voice Coil Subwoofer PAIR (2) Dual 4 Ohm Coil - Can be wired in parallel to achieve 2 Ohm load Frequency response 42Hz-4000Hz, Power Handling 70-150 Watts Sensitivity: 79.74dB Mounting Depth 2.75", FS: 42.39Hz